The shooting happened at about 10:06 p.m. on Wednesday in the 6400-block of N. Campbell Avenue, police said.
A 48-year-old man was walking outside when a man tried to rob him, police said.
The victim yelled for help, and the suspect shot in the man's direction.
The 48-year-old man was shot in the right arm and was taken to an area hospital. He is expected to be OK.
Nobody is in custody.
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A few hours later, an 18-year-old woman was shot to death near Loyola Beach, police said.
Police did not say if the shootings were related.